i used lee during the year and excel before tests, lee is pretty shit on explanation of concepts and a few of the questions are screwy but it ain't too bad.
I have Cambridge and Fitzpatrick, and am thinking of buying excel as well.
Sorry, I've never heard of Terry Lee... is it a good source?
And does anyone know where to get recent 4U past papers with solution? cause they obviously don't have it on Success One series. I wonder why.
Coroneos past papers are good. His books are a bit confusing, though - probably because of the formatting and the things which aren't in the syllabus... and maybe also because of the fact that you need to buy a supplement to have a full 4u textbook.